My exhaust fan works well. When I disconnect the vent pipe fro the top of the oven, there is a healthy stream of air. However, even with smake in the broilder, no smoke comes out of the exhaust. I removed the filters and can see through from front to back, and there is no ibstruction.

I did remove the oven from the wall just before this started to happen (in ordeer to repaor an bad heating element. all the paels are back in place.

What is goig on? Where is the exhausts air coming from if not from the oven?